(1) - Phaeton (n.) A handsome American butterfly (Euphydryas, / Melitaea, Phaeton). The upper side of the wings is black, with orange-red spots and marginal crescents, and several rows of cream-colored spots; -- called also Baltimore.(2) - Phaeton (n.) See Phaethon.(3) - Phaeton (n.) A four-wheeled carriage (with or without a top), open, or having no side pieces, in front of the seat. It is drawn by one or two horses.